High-nickel austenite nodular cast iron production process adopting wire-feeding spheroidizing

Abstract

The invention provides a high-nickel austenite nodular cast iron production process adopting wire-feeding spheroidizing. The high-nickel austenite nodular cast iron production process adopting wire-feeding spheroidizing comprises the steps of material preparation, smelting and ingredient adjustment, spheroidizing, casting, box disassembling and after-treatment and thermal treatment. The production process is characterized in that the spheroidizing is wire-feeding spheroidizing; the bad metallographic phase problem of castings can be avoided, the castings are made to be stable in quality, the production cost is low, and the reject ratio is low; meanwhile, labor intensity can be relieved, working conditions can be improved, and working efficiency is improved; dust generated in the spheroidizing procedure is easy to control, and the process is more environmentally friendly.

Description

technical field [0001] The invention relates to a production process of high-nickel austenitic nodular cast iron adopting wire-feeding spheroidization treatment. Background technique [0002] The turbocharger housing and the exhaust manifold are important parts of the engine with the turbocharger function. Both the turbocharger and the exhaust manifold work at high temperatures, so the high temperature resistance of the material is required to be at 850°C Above, most of the high-nickel austenitic ductile iron is used at present. In the existing production process of high-nickel austenitic nodular cast iron, the spheroidizing process adopts the sandwich spheroidizing method, and the spheroidizing agent adopts silicon-magnesium spheroidizing agent or nickel-magnesium spheroidizing agent. When silicon magnesium (Si: 40 to 50%, Mg: 6 to 8%) spheroidization process is used, the proportion of nodulizer added is relatively high (1.6 to 1.8%), and the amount of silicon increased du...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in existing products, and provide a kind of high-nickel austenitic nodular cast iron production process that adopts wire-feeding spheroidization treatment, which can avoid the metallographic problem of castings and make the quality of castings stable. Low production cost and low defect rate; at the same time, it can improve labor intensity and working conditions, and improve work efficiency; the dust generated during the spheroidization process is easy to control and is more environmentally friendly